Piezoelectric ceramic composition
AssigneeKYOCERA Corporation
InventorsTakeshi Hirayama, Shuhei Tabata, Gen Shimura
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Abstract
A piezoelectric ceramic composition is represented by a composition formula AxBO3 and includes potassium sodium niobate containing K and Na that account for 80% or more of an amount of A-site elements and containing Nb that accounts for 70% or more of an amount of B-site elements. The piezoelectric ceramic composition contains Ta and Fe at a B-site.
Claims14
A piezoelectric ceramic composition represented by a composition formula AxBO3, the piezoelectric ceramic composition comprising:
- potassium sodium niobate containing K and Na that account for 80% or more of an amount of A-site elements and containing Nb that accounts for 70% or more of an amount of B-site elements,
- wherein the piezoelectric ceramic composition comprises Ta and Fe at a B-site,
- wherein the piezoelectric ceramic composition is represented by a composition formula
- {(K1-u-vNauLiv)1-w-αAgwA1α}x{(Nb1-y-zTaySbz)1-β-γ-δB1βB2γFeδ}O3
- wherein
- A1 is Bi, La, Ce, Nd, or Sm or a combination thereof,
- B1 is Zn, Mg, Yb, Fe, Cu, Co, or Ni or a combination thereof, and
- B2 is Sn, Ti, Zr, Hf, Ce, Ge, V, W, Nb, Sb, or Ta or a combination thereof, and
- wherein the following inequalities are satisfied:
- 0.500≤u≤0.540,
- 0.00<v≤0.06,
- 0.00<w≤0.06,
- 0.99≤x≤1.02,
- 0.00<y≤0.12,
- 0.00<z≤0.10,
- 0.0000<α≤0.0275,
- 0.000<β≤0.005,
- 0.000<γ≤0.005, and
- 0.0000<δ≤0.0125.
A piezoelectric ceramic composition represented by a composition formula AxBO3, the piezoelectric ceramic composition comprising:
- potassium sodium niobate containing K and Na that account for 80% or more of an amount of A-site elements and containing Nb that accounts for 70% or more of an amount of B-site elements,
- wherein the piezoelectric ceramic composition comprises Ta and Fe at a B-site,
- wherein the piezoelectric ceramic composition comprises a Ta segregation part in which Ta is unevenly distributed, and
- wherein a ratio of an amount of Fe element to an amount of all elements in the Ta segregation part is larger than a ratio of an amount of Fe element to an amount of all elements in a reference part having at least a portion different from the Ta segregation part.
A piezoelectric ceramic composition represented by a composition formula AxBO3, the piezoelectric ceramic composition comprising:
- potassium sodium niobate containing K and Na that account for 80% or more of an amount of A-site elements and containing Nb that accounts for 70% or more of an amount of B-site elements, wherein
- the piezoelectric ceramic composition comprises Ta and Fe at a B-site,
- the piezoelectric ceramic composition is represented by a composition formula
- {(K1-u-vNauLiv)1-w-αAgwA1α}x{(Nb1-y-zTaySbz)1-β-γ-δB1βB2γFeδ}O3
- wherein
- A1 is Bi, La, Ce, Nd, or Sm or a combination thereof,
- B1 is Zn, Mg, Yb, Fe, Cu, Co, or Ni or a combination thereof,
- B2 is Sn, Ti, Zr, Hf, Ce, Ge, V, W, Nb, Sb, or Ta or a combination thereof, and
- v, w, y, z, α, β, γ, and δ are larger than 0.
Dependencies are inferred from the claim text.